Suspension hook and inspection jig

Abstract

The present invention provides a suspension hook that makes it possible to accurately measure the degree of opening of a hook.　The present invention comprises: a base end part 11 that is provided extending downward from a connection part 32 for suspension; a curved part 13 that is formed so as to be curved in an arc shape from one end thereof, which is the lower end of the base end part 11, toward the other end thereof; a tip part 12 that is connected to said other end of the curved part 13 and that is provided extending upward; and an inner part 30 that is surrounded by the base end part 11, the curved part 13, and the tip part 12, wherein the base end part 11, the curved part 13, and the tip part 12 each have an inner peripheral part 10a, which is in contact with the inner part 30, and an outer peripheral part 10c, which is on the opposite side from the inner peripheral part 10a, the outer peripheral part 10c of the base end part 11 has a first outer peripheral surface 11b that linearly extends in the extending direction and that is positioned above the curved center of the curved part 13, the outer peripheral part 10c of the tip part 12 has a second outer peripheral surface 12b that is positioned so as to linearly extend upward in the extending direction from below the curved center of the curved part 13, and the first outer peripheral surface 11b and the second outer peripheral surface 12b are in a positional relationship such that the first outer peripheral surface 11b and the second outer peripheral surface 12b face outwardly and are parallel to each other.

Description

Hanging hooks and inspection jigs

[0001] The present invention relates to a hanging hook and an inspection jig.

[0002] Devices for lifting and lowering loads, such as hoists, have hooks at the bottom of wire ropes, chains, etc. that hang down below the device for connecting to the load. When an excessive load is applied to a hook, the tip of the hook gradually undergoes plastic deformation, opening up, and the dimensions of the hook opening become larger. Since the opening dimensions became larger, it is assumed that an excessive load was applied to the hook and the hoist equipped with the hook, and it is therefore recommended that the dimensions of the opening be managed for safety reasons.

[0003] Patent Document 1 discloses a hook as an attachment for use in a lifting chain sling. The hook is deformed so that its tip opens, and is equipped with a marking to notify an operator that the hook should be replaced. The markings are embossed on both the base and tip of the hook, and an operator can determine the degree of opening of the hook by measuring the distance between these two markings with a vernier caliper or the like.

[0004] Special Publication No. 7-501776

[0005] However, the hook disclosed in Patent Document 1 may be subject to twisting or other distortions caused by heat treatment or forging during manufacturing, which may result in variations in the initial dimensions between the markers. Furthermore, because the tip of the hook is thinner than the base, if the height of the markers protruding from the side of the hook is to be uniform in order to facilitate measurement of the markers, it is necessary to make the marker at the tip higher. However, because the hook is forged, it is difficult to make the marker higher. Furthermore, forging sags can cause rounding on the sides of the marker, making it difficult to hook a vernier caliper or other tool. This can make it difficult to quickly measure the dimensions between the markers using a vernier caliper or other tool.

[0006] The present invention has been made in view of the above circumstances, and has as its object to provide a hanging hook and an inspection jig that are capable of quickly and accurately measuring the degree of opening of the hook.

[0007] A hanging hook according to one aspect of the present invention comprises a base end portion that extends downward from a hanging connecting portion when hung, a curved portion that extends from the lower end of the base end and is curved in an arc from the lower end to the other end, a tip end portion that is connected to the other end of the curved portion and extends upward, and an inner portion surrounded by the base end portion, the curved portion, and the tip end portion, wherein the base end portion, the curved portion, and the tip end portion each have an inner periphery that is in contact with the inner portion and an outer periphery on the opposite side of the inner periphery, and the outer periphery of the base end portion has a first outer periphery that extends linearly in the extension direction and is located above the center of curvature of the curved portion when hung, and the outer periphery of the tip end portion has a second outer periphery that extends linearly in the extension direction and is located from below to above the center of curvature of the curved portion when hung, and the first outer periphery and the second outer periphery are in a positional relationship facing outward and parallel to each other.

[0008] Moreover, a hanging hook according to one aspect of the present invention comprises a base end portion that extends downward from a hanging connection portion when hung, a curved portion that extends from the lower end of the base end and is curved in an arc shape from the lower end to the other end, a tip end portion that is connected to the other end of the curved portion and extends upward, and an inner portion surrounded by the base end portion, the curved portion, and the tip end portion, and the base end portion, the curved portion, and the tip end portion have an inner periphery that contacts the inner portion and an outer periphery on the opposite side to the inner periphery, and the outer periphery of the base end portion and the tip end portion The outer periphery of the end has an outer periphery surface that extends in a straight line, and the first outer periphery surface that is the outer periphery surface of the base end and the second outer periphery surface that is the outer periphery surface of the tip end are parallel to each other, and the inspection jig that inspects the opening of the hanging hook can insert the hanging hook into the insertion part only when the opposing inner surfaces of the insertion part that is inserted from the curved part side are parallel, and the opening angle of the hanging hook is an angle at which the outer periphery surface that extends in a straight line of the base end and the outer periphery surface that extends in a straight line of the tip end both slide in parallel with the inner surfaces.

[0009] Furthermore, one aspect of the hanging hook of the present invention is a hanging hook having a thick portion extending toward the inner diameter side and a thin portion extending from the thick portion toward the outer diameter side and being thinner than the thick portion, and is equipped with a base end portion extending downward from the hanging connecting portion and having a base end side recess on its outer peripheral surface, and a tip end portion facing the base end and having a tip end side recess on its outer peripheral surface.

[0010] Furthermore, one aspect of the present invention is an inspection jig for inspecting the opening of a hanging hook, which comprises a main body portion having a storage portion into which a hanging hook is inserted and stored, and groove portions provided on both ends of the storage portion in the width direction, formed inside the main body portion, extending linearly in the insertion direction, and preventing the hanging hook from moving in any direction other than the insertion direction, and when the hanging hook is stored in the storage portion, the inner surfaces of a pair of groove portions facing each other in the radial direction of the hanging hook are parallel to each other, and the distance between the inner surfaces is set so that the hanging hook slides against them.

[0011] According to the present invention, it is possible to provide a hanging hook and an inspection jig that can measure the degree of opening of the hook quickly and accurately.

[0012] FIG. 1 is a side view showing a chain block having a suspension hook according to the first embodiment. FIG. 2 is a side view showing the suspension hook according to the first embodiment. FIG. 3 is a cross-sectional view showing the suspension hook of FIG. 2 cut along line A-A, which passes through the recesses provided at the base end and the tip end, as viewed from the direction of the arrows. FIG. 4 is a view showing modified recesses in the suspension hook according to the first embodiment. A and B show cases where the shape of the recess is different from that of the suspension hook of the first embodiment, and C shows a case where the shape of the suspension hook is different from that of the first embodiment. FIG. 5 is a perspective view showing an inspection jig for inspecting the degree of opening of a suspension hook according to the second embodiment. FIG. 6 is an explanatory diagram illustrating the insertion of a suspension hook into an inspection jig for inspecting the degree of opening of a suspension hook according to the second embodiment. A shows a state where the suspension hook can be inserted into the inspection jig, and B shows a state where the suspension hook cannot be inserted into the inspection jig. FIG. 7 is an explanatory diagram illustrating a suspension hook and its inspection jig according to a comparative example.

[0013] The hanging hook according to this embodiment will be described below with reference to the drawings. In the following description, the "outer diameter side of the hanging hook" refers to the side facing radially outward from the approximately U-shaped space defined by the base end, curved portion, and tip end of the hanging hook 10, and the "inner diameter side of the hanging hook" refers to the side facing radially inward toward the approximately U-shaped space.

[0014] [First Embodiment] (Chain Block) Fig. 1 is a side view showing a chain block 1 having a hanging hook 10 according to this embodiment. In this embodiment, a case where the hanging hook 10 is applied to a manual chain block 1 will be described, but it can also be applied to an electric chain block, other hoists, chain slings, etc.

[0015] The chain block 1 includes a chain block body 2, an upper hook 3, a load chain 4, a hanging hook 10, and a hand chain 5.

[0016] The chain block body 2 is mainly composed of a frame (not shown), and houses a load sheave with which the load chain 4 engages, a hand wheel with which the hand chain 5 engages, a speed reduction mechanism composed of gears, and the like.

[0017] The upper hook 3 is connected to the top of the frame of the chain block body 2 and hangs the chain block 1 from a beam or the like of a structure.

[0018] The load chain 4 is unwound from a load sheave that is provided on the chain block body 2 and supports the load chain 4, and supports the weight of the suspended load via a hook, thereby lifting and lowering the suspended load.

[0019] The hanging hook 10 is connected to the lower end of the load chain 4 on the load side, and is hooked onto the load or the eye of the load to support the load.

[0020] The hand chain 5 is unwound from the hand wheel of the chain block body 2 and rotates in one direction or the other in response to the operator's manual pulling action. When the hand wheel rotates in the direction corresponding to the manual pulling action of the hand chain 5, the rotation is transmitted to the load sheave via a speed reduction mechanism, and the hanging hook 10 moves up and down.

[0021] (Hanging Hook) FIG. 2 is a side view showing the hanging hook 10 according to this embodiment.

[0022] The direction passing through the center of imaginary circle 31 shown in Fig. 2 and along the load chain 4 shown in Fig. 1 is defined as the Z axis, the left-right direction in Fig. 1 that is perpendicular to the Z axis and crosses the base end and tip end of the hanging hook 10 is defined as the X axis, and the depth direction in Fig. 1 that is perpendicular to the X and Y axes is defined as the Y axis. Imaginary circle 31 is an imaginary circle that is tangent to the inner edge of curved portion 13, which will be described later, and its radius matches the minimum radius of curvature of the inner edge of curved portion 13.

[0023] The hanging hook 10 is connected via a connecting fitting 6 to the lower end of a load chain 4 hanging down from the load sheave of the chain block body 2 .

[0024] The hanging hook 10 has a base end 11 having a connecting portion 32 that connects to the connecting fitting 6, a tip end 12, a curved portion 13, a base end recess 14, and a tip end recess 15. The base end 11, tip end 12, and curved portion 13 are partial areas of the hanging hook 10, and are integrally formed so as to extend downward from the connecting portion 32 when the hanging hook 10 is suspended.

[0025] Specifically, the hanging hook 10 has a base end 11, a curved portion 13, and a tip end 12, in this order. A connecting portion 32 extends from one end of the base end 11, one end of a curved portion extends continuously from the other end of the base end 11, and one end of the tip end 12 extends continuously from the other end of the curved portion 13. An inner portion (bosom portion) 30 surrounded by the base end 11, the curved portion 13, and the tip end 12 in a U-shape is formed, and the hanging hook has an inner edge portion 10b that contacts the inner portion 30 and an outer edge portion 10c as an outer periphery on the opposite side of the inner edge portion 10b. The outer edge side of the hanging hook is the outer diameter side of the hanging hook.

[0026] The base end portion 11 includes a connecting portion 32 and serves as a joint portion that joins the connecting portion 32 and the bending portion 13 .

[0027] The curved portion 13 is a portion of the hanging hook 10 that supports a hanging portion such as a load or a sling, and is curved toward the pocket portion 30 of the hanging hook 10. The inner peripheral surface 10a, which serves as the inner periphery, is the outer surface of the inner peripheral portion 10b of the thick portion 17 of the curved portion 13, the surface facing the pocket portion, and is in contact with the imaginary circle 31. The inner peripheral surface 10a is connected to the flat surfaces (17a, 17b) of the thick portion 17. A thin portion 16 is formed on the outer peripheral side (outer peripheral portion 10c) of the thick portion 17, opposite the inner peripheral surface 10a. The thin portion 16 has flat surfaces (16a, 16b), and a boundary step 13a of the curved portion 13 is formed at the boundary between the flat surfaces (17a, 17b) of the thick portion 17 and the flat surfaces (16a, 16b) of the thin portion 16. An outer edge surface 13b is formed on the outer edge of the thin portion 16 of the curved portion 13. The thick portion 17 protrudes from the boundary step portion 13a relative to the thin portion 16 to flat surfaces (17a, 17b) on both sides in the Y-axis direction.

[0028] The tip portion 12 is a member that extends in a substantially straight line so as to gradually taper from the other end of the curved portion 13 toward the tip of the tip portion 12. The boundary between the thick portion 17 and the thin portion 16 of the tip portion 12 has a boundary step 12a that extends continuously from the boundary step 13a of the curved portion 13 toward the tip. There is a predetermined gap between the tip portion 12 and the base end portion 11, so that a hanging portion of a load or the like can be inserted into the pocket portion 30 of the hanging hook 10.

[0029] The thick portion 17 of the base end 11 has one end connected to the connecting portion 32 and extends obliquely downward in a substantially linear fashion from the connected end to the other end. A boundary step 11a is formed at the boundary between the thin portion 16 formed on the outer edge of the base end 11 and the thick portion 17 of the base end 11, and an outer edge portion 10c extending linearly and an outer edge surface 11b serving as a first outer peripheral surface are formed on the outer edge of the thin portion 16. The outer edge surface 11b extends obliquely upward in a linear fashion continuous with the outer edge surface 13b of the curved portion 13, and the outer edge surface 11c extends linearly from the outer edge surface 13b toward the lower end side of the connecting portion 32 (one end side of the base end 11).

[0030] As shown in Figure 2, when the hanging hook 10 is hung, the angle θb between the X axis, which is a horizontal plane, and the outer edge surface 11b is larger than the angle θa between the X axis, which is a horizontal plane, and the outer edge surface 11b, and the angle θc between the X axis and the boundary step portion 11a has the relationship θa<θc<θb.

[0031] Therefore, the thin portion 16 of the base end portion 11 has a larger area than the other thin portions, and is shaped so that the operator can easily pinch and grip it with their fingertips.

[0032] When the hanging hook 10 is suspended, the angle θb between the horizontal X-axis and the linearly extending outer edge surface 11b is set to 75°±5°, and preferably in the range of 72° to 78°.

[0033] The thick portion 17 of the distal end portion 12 is formed in a straight line extending diagonally upward from the thick portion of the curved portion 13, facing substantially parallel to the thick portion of the base end portion 11. The distal end portion 12 has an outer edge surface 12b as a second outer peripheral surface that is formed in a straight line extending diagonally upward from the outer edge surface 13b of the curved portion 13, and that extends in a straight line from below to above the center of the imaginary circle 31 in a suspended state. The outer edge surface 12b of the distal end portion 12 and the outer edge surface 11b of the base end portion 11 are formed parallel to each other.

[0034] The flat surfaces (17a, 17b) of the thick portion 17 are flat from the base end portion 11 to the curved portion 13 so that bending in the Y-axis direction (twisting of the hook) can be confirmed.

[0035] Defining the relationship between the outer edge surface 11b of the base end and the outer edge surface 12b of the tip end, the linearly extending outer edge surface 11b of the base end 11 is located above the center of the imaginary circle 31, while the linearly extending outer edge surface 12b of the tip end 12 is located from below to above the center of the imaginary circle 31, and the linearly extending outer edge surface 11b of the base end 11 and the linearly extending outer edge surface 12b of the tip end 12 are parallel to each other. Therefore, the linearly extending first outer edge surface (linearly extending outer edge surface 11b) of the base end 11 and the linearly extending outer edge surface (linearly extending outer edge surface 12b) of the tip end 12, which serve as the first deformation detection unit, are used to detect a change (deformation) in the opening angle of the hanging hook 10.

[0036] Because the base end 11 and the tip end 12 have straight portions that are parallel to each other on the outer edge of the outer edge portion 10c, it is also possible to visually check whether the hanging hook 10 has opened or not, and by simply checking the difference in distance between the base end 11 and the tip end 12 at two points on the line, the degree of opening due to deformation of the hanging hook 10 can be checked without using a special jig or measuring device.

[0037] Furthermore, when using an inspection jig 90 (described later) to check the degree of opening due to deformation, the presence of this parallel portion makes it possible to reliably insert the hanging hook 10 in a fixed posture by dropping it into the groove 92 of the inspection jig 90. Therefore, it can be said that this shape is optimized for inspection using the inspection jig 90.

[0038] The hanging hook 10 has a thick portion 17 that extends from the base end 11 to the tip end 12, via one end of the curved portion 13 to the other end, toward the inner edge side, which is the inner diameter side (the pocket portion 30 side) of the hanging hook 10, and is thick in the Y-axis (depth in the paper) direction; a thin portion 16 that extends from the thick portion 17 toward the outer edge side, which is the outer diameter side, and is thin in the Y-axis (depth in the paper) direction; and a boundary portion 18 that connects the thick portion 17 and the thin portion 16.

[0039] The boundary portion 18 further has a pair of linear boundary portions 18c that are part of the boundary portion 18 between the thick portion 17 and the thin portion 16 and are provided at the base end 11 and the tip end 12, respectively. The pair of linear boundary portions 18c, which serve as second deformation detection portions, can visually detect the opening of the hanging hook 10. The linear boundary portions 18c may be provided parallel to each other, or may be formed at an angle so that they approach each other as they move away from the curved portion 13, and so that they approach each other when an overload is applied to the hanging hook 10.

[0040] The above-mentioned boundary step portion 11a formed in a straight line diagonally downward from the base end portion 11 and the boundary step portion 12a formed in a straight line diagonally upward from the tip end portion 12 refer to the boundary portion 18, which is an inclined surface 18a that transitions from the thick portion 17 to the thin portion 16.

[0041] The thick portion 17 and the thin portion 16 have surfaces 17a and 16a on the near side of the paper in FIG. 2 and surfaces 17b and 16b on the far side of the paper corresponding to the surfaces 17a and 16a (FIG. 3). The surfaces 17a and 17b of the thick portion 17 and the surfaces 17b and 16b of the thin portion 16 are both parallel to the X-Z plane and are parallel to each other. The tip portion 12 of the thick portion 17 also gradually tapers in the Y-axis direction from one end of the tip portion to the other end (tip). The thick portion 17 and the thin portion 16 are also molded perpendicular to the bottom surfaces of the base-side recess 14 and the tip-side recess 15, which will be described later.

[0042] In addition, the hanging hook 10 is formed so that the radial width B of the base end 11 perpendicular to the extension direction of the base end 11 is smaller than the diameter C of the approximately circular imaginary circle 31 defined by the inner edge surface 10a on the inner diameter side of the hanging hook 10.

[0043] The thin-walled portion 16 is formed with a base-end recess 14 formed at the base end 11 and recessed toward the inner diameter side of the hanging hook 10, and a tip-end recess 15 formed at the tip end 12 and recessed toward the inner diameter side of the hanging hook 10. The base-end recess 14 and the tip-end recess 15 are positioned so that a straight line connecting the base-end recess 14 and the tip-end recess 15 does not interfere with the hook latch 21 when the hook latch 21 is positioned in a narrowed portion 24, which will be described later. The straight line connecting the base-end recess 14 and the tip-end recess 15 is formed at a position perpendicular to the linearly extending outer edge surfaces 11b, 12b.

[0044] The base end recess 14 is formed on the outer edge surface 11b that is formed in a straight line obliquely upward from the outer edge surface 13b of one end side of the curved portion 13 of the base end 11, on the opposite side of the curved portion 13, which is on the connecting portion 32 side, from a position 19 where the bending force acting on the hanging hook 10 when a load is applied is maximized. The tip end recess 15 is formed on the outer edge surface 12b that is formed in a straight line obliquely upward from the outer edge surface 13b of the other end side of the curved portion 13 of the tip end 12. The position 19 where the bending force acting on the hanging hook 10 is maximized is located at a position where the X-axis crosses the base end 11.

[0045] The bottom surfaces 14a, 15a of the base end recess 14 and the tip end recess 15 are formed approximately parallel to each other on the linear outer edge surfaces 11b, 12b of the base end portion 11 and the tip end portion 12, respectively.

[0046] Here, the base end recess 14 and the tip end recess 15 will be further described with reference to Figure 3. Figure 3 is a cross-sectional view showing the hanging hook of Figure 2 cut along line AA and viewed from the direction of the arrows.

[0047] The base-side recess 14 has a bottom surface 14a which is the bottom surface side of the recess of the base-side recess 14, and the bottom surface 14a is formed in a flat shape. Similarly, the tip-side recess 15 has a bottom surface 15a which is the bottom surface side of the recess of the base-side recess 14, and the bottom surface 15a is formed in a flat shape.

[0048] The base-end recess 14 and the tip-end recess 15 are reference marks provided to check whether the opening distance, which is the gap between the base end 11 and the tip end 12 of the hanging hook 10, is within a predetermined reference dimension. The width of the base-end recess 14 and the tip-end recess 15 in the direction along which the outer edge surfaces 11b, 12b extend linearly is set slightly wider than the thickness of the outer jaw of a vernier caliper. Therefore, the distance between the base-end recess 14 and the tip-end recess 15 can be easily measured at the same location by, for example, using a vernier caliper with one jaw placed against the base-end recess 14 and the other jaw placed against the tip-end recess 15, sandwiching the base-end recess 14 and the tip-end recess 15 between them. Alternatively, instead of using a measuring instrument such as a vernier caliper, an exchangeable gauge may be used to check whether the opening distance is within a predetermined reference dimension.

[0049] The base recess 14 and the tip recess 15 have flat bottom surfaces 14a and 15a, respectively, so that the orientation of the caliper can be adjusted immediately when the caliper jaws are placed on the base recess 14 and the tip recess 15, making it easier to measure the opening distance. If the distance between the base recess 14 and the tip recess 15 is greater than a predetermined value, it can be assumed that an overload has been applied to the hanging hook 10, and the hanging hook 10 should no longer be used.

[0050] The flat surfaces 17a, 17b of the thick portion 17 are formed parallel to the X-Z plane and perpendicular to the bottom surfaces 14a, 15a. Therefore, for example, when checking dimensions using a gauge or the like, when aligning the gauge or the like with the base end recess 14 and the tip end recess 15, by pressing the gauge or the like against the flat surface of the thick portion 17, it is possible to prevent the gauge or the like from becoming slanted, and the gauge or the like can be aligned easily.

[0051] As described above, the thin-walled portion 16 is thin in the Y-axis (depth direction) direction, and as shown in FIG. 3 , the thin-walled portion 16 at the base end 11 is larger than the thin-walled portion 16 at the tip end 12 both in the radial direction and the vertical direction of the drawing. As shown in FIG. 2 , the thin-walled portion 16 extends continuously from the tip end 12 to the curved portion 13 and then to the base end 11, increasing in size in that order, with the thin-walled portion 16 being largest near the intersection of the outer edge surface 11b and the outer edge surface 11c of the base end 11. That is, the thin-walled portion 16 at the base end 11 extends radially outward beyond the other portions into a flat plate shape that can be grasped by an operator. This allows an operator to easily grasp the hanging hook 10 by pinching the thin-walled portion 16, improving the operability of operations performed while grasping the hanging hook 10.

[0052] As mentioned above, the bending force acting on the hanging hook 10 is greatest near position 19 where the bending force of the base end 11 is greatest, so the strength of the hanging hook 10 can be improved by increasing the radial dimension of the base end 11 in the cross section of the hanging hook 10.

[0053] Since the thin portion 16 of the base end 11 has the largest area, numbers and letters are embossed on the thin portion 16 as information about the hanging hook 10, such as the load capacity. In Figure 2, for example, "MAX 95" is written to indicate the maximum opening distance. Note that the numbers and letters do not have to be embossed, but may be three-dimensionally written in a convex or concave shape from the surrounding area, or printed by a method such as engraving or painting.

[0054] As shown in Figure 2, the hanging hook 10 further has a hook latch 21 for preventing the load suspended from the hanging hook 10 from coming off the hanging hook 10, a support shaft 22 which is the rotation axis of the hook latch 21, and a torsion coil spring 23 which constantly biases the hook latch 21 toward the inner diameter side of the tip portion 12.

[0055] The support shaft 22 is provided at a position facing the tip end 12 of the base end 11. The torsion coil spring 23 is coaxially attached to the support shaft 22 and constantly applies a biasing force to the hook latch 21 so that the hook latch 21 rotates counterclockwise in FIG. 2 . As a result, the hook latch 21 is constantly biased toward the abutting portion at the tip end 12, and this portion, which serves as the third deformation detection portion, can visually detect deformation of the hanging hook 10. In particular, if a sharp portion or the like is present on the tip side of the hook latch 21 and an arc-shaped scratch is formed in the narrow portion 24 against which the hook latch 21 abuts, the degree of deformation of the hanging hook 10 can be visually detected by observing the change in the radius of the arc-shaped scratch. A narrow portion 24, in which the axial width of the thick-walled portion 17 is narrow, is formed on the inner diameter side of the hanging hook 10. The tip of the hook latch 21 is formed as a fork, and when the tip of the hook latch 21 rotates and abuts against the tip portion 12, the fork fits into both sides of the narrow portion 24. This prevents the hook latch 21 from shifting in the axial direction of the tip portion 12 and causing the load to come off the lifting hook 10, even if a force acts on the hook latch 21 in the support axis direction.

[0056] When a load is to be hung from the hanging hook 10, the hook latch 21 is rotated clockwise in FIG. 2 against the biasing force of the torsion coil spring 23, and with the tip of the hook latch 21 and the narrow portion 24 of the tip portion 12 spaced apart, a sling or the like of the load can be hooked into the hanging hook 10.

[0057] [Second Embodiment] In the first embodiment, the opening distance, which is the gap between the base end 11 and the tip end 12 of the hanging hook 10, is measured using a vernier caliper to check whether the opening distance is within a predetermined reference dimension. However, in this embodiment, a dedicated inspection jig is used for the inspection. Note that in the first embodiment, the hanging hook 10 was described using the X-axis and Z-axis in Figures 1 and 2, but in this embodiment, the axes are described using new X-axis, Y-axis, and Z-axis in Figures 5 to 7, which are independent of the first embodiment. Furthermore, the same reference numerals are used to designate the same components as in the first embodiment, and their description will be omitted.

[0058] 5 is a perspective view showing an inspection jig 90 for inspecting the opening of the suspension hook 10 according to this embodiment. The inspection jig 90 includes a main body 91 and a groove 92.

[0059] The main body 91 has an integrated structure in which four wall portions 91a are combined into a substantially rectangular shape. The four wall portions 91a form a storage portion 91b that stores the hanging hook 10 inserted therein. One of the wall portions 91a of the main body 91 (the wall portion 91a on the front side in the direction of the Y-axis arrow) has an opening 91c that communicates with the storage portion 91b. Therefore, the wall portions 91a facing the opening 91c are located at both ends in the X-axis direction. This opening 91c is used to remove the hanging hook 10 from the inspection jig 90 when the hanging hook 10 is inserted into the inspection jig 90.

[0060] Furthermore, an insertion portion 91f, which is an opening for inserting the hanging hook 10, is formed on the upper surface 91d and the lower surface 91e of the main body 91, which is cut approximately perpendicular to the XY plane, and the insertion portion 91f communicates with the storage portion 91b. Note that the inspection jig 90 does not need to be used in the orientation shown in Figure 5, and will function as the inspection jig 90 regardless of the orientation in which it is used. Furthermore, the inspection jig 90 can be inserted from either the upper surface 91d side or the lower surface 91e side.

[0061] The grooves 92 are part of the accommodation portion 91b and are provided on both ends of the accommodation portion 91b in the X-axis direction. Because the grooves 92 are surrounded by four walls 91a, they prevent the hanging hook 10 from moving in any direction other than the Z-axis direction. The shape of the grooves 92 is formed to fit along the thin portions of the hanging hook 10 (see A in FIG. 6). The distance in the X-axis direction between the pair of grooves 92 (i.e., the width of the accommodation portion 91b) is set slightly larger than the distance between the outer edge surfaces 11b, 12b of the hanging hook 10. This allows the hanging hook 10 to move linearly while sliding along the grooves 92.

[0062] The groove 92 is formed so as to have the same width from the upper surface 91d to the lower surface 91e along the Z-axis direction of the main body 91. As a result, when the hanging hook 10 is inserted into the inspection jig 90, the hanging hook 10 can slide in the Z-axis direction from the upper surface 91d to the lower surface 91e, or vice versa. Note that the groove 92 may be shaped so that only a portion of it, for example, near the lower surface 91e, extends inward along the Z-axis direction to form an XY plane, thereby blocking the vicinity of the lower surface 91e of the groove 92 (or the accommodation portion 91b). As a result, the extended portion acts as a stopper, and the hanging hook 10 inserted into the inspection jig 90 from the upper surface 91d cannot slide near the lower surface 91e, thereby preventing the hanging hook 10 from falling off the side opposite the insertion side.

[0063] The pair of grooves 92 each have an inner surface 92a at the end in the X-axis direction, and these inner surfaces 92a are formed to be parallel to each other. The distance between the inner surfaces 92a is set to an extent that the linearly extending outer edge surfaces 11b, 12b (FIG. 2) of the hanging hook 10 can be accommodated while sliding.

[0064] (Inspection jig 90: inspection) A case will be described where the opening of the suspension hook 10 is inspected using the inspection jig 90. Fig. 6 is an explanatory diagram illustrating the state where the suspension hook 10 is inserted into the inspection jig 90 that inspects the degree of opening of the suspension hook 10 according to this embodiment. A shows a state where the suspension hook 10 can be inserted into the inspection jig 90, and B shows a state where the suspension hook 10 cannot be inserted into the inspection jig 90. In Fig. 6A, the upper figure is a partial cross-sectional view showing the state where the lower figure is cut along line H-H and viewed from the direction of the arrows, and the lower figure is a partial cross-sectional view showing the state where the upper figure is cut along line G-G and viewed from the direction of the arrows.

[0065] When the suspension hook 10 is subjected to an overload strong enough to cause plastic deformation, the opening distance between the distal end 12 and the proximal end 11 increases. If this opening distance exceeds a predetermined limit opening distance, the hook is no longer in use for safety reasons. Since the suspension hook 10 is periodically inspected to determine whether the opening distance is at the limit opening distance, it is desirable that the inspection be performed as quickly and simply as possible while maintaining accuracy.

[0066] The dimensions of the inspection jig 90 are set so that the shortest distance Lmax between the inner surfaces 92a of a pair of groove portions 92 in the X-axis direction of the inspection jig 90 and the shortest distance L between the linear outer edge surfaces 11b, 12b of the hanging hook 10, which is the size of the hanging hook 10 in the X-axis direction, are the same or approximately the same (B in Figure 6).

[0067] Specifically, the shortest distance Lmax between the inner surfaces 92a of the grooves in the X-axis direction of the inspection jig 90 is set to a value that allows the linear outer edge surfaces 11b, 12b of the hanging hook 10 to be accommodated while sliding on the inner surface 92a of the inspection jig 90 when inserted into the inspection jig 90. For this reason, the hanging hook 10 can be inserted into the inspection jig 90 only when the opening distance is equal to or less than the limit opening distance, and cannot be inserted into the inspection jig 90 when the opening distance exceeds the limit opening distance due to deformation of the hanging hook 10.

[0068] Furthermore, since the linearly extending outer edge surfaces 11b, 12b of the hanging hook 10 are parallel to each other, and the inner surfaces 92a at both ends of the X-axis direction of the pair of groove portions 92 of the inspection jig 90 are parallel to each other, even if the opening distance is less than the limit opening distance, the hanging hook 10 cannot be inserted into the inspection jig 90 unless the relative inclination of the outer edge surfaces 11b and 12b of the hanging hook 10 centered on the Y-axis and the inner surface 92a of the inspection jig 90 matches.

[0069] For example, in B of Fig. 6, the hanging hook 10 is slightly shifted counterclockwise around the Y-axis direction from A of Fig. 6. In this state, even if the opening distance is within the limit opening distance and the shortest distance Lmax between the inner surfaces 92a of the grooves in the X-axis direction of the inspection jig 90 and the shortest distance L between the linear outer edge surfaces 11b, 12b of the hanging hook 10 are approximately the same, the hanging hook 10 cannot be inserted into the inspection jig 90 because the parallel portions of the hanging hook 10 in the insertion portion 91f of the inspection jig 90 are not aligned linearly.

[0070] In this case, when the hanging hook 10 is tilted clockwise around the Y-axis direction so that the inner surface 92a of the groove in the inspection jig 90 and the linear outer edge surfaces 11b, 12b of the hanging hook 10 are aligned in a straight line and parallel to each other, the hanging hook 10 is inserted into the inspection jig 90 (A in Figure 6).

[0071] On the other hand, if the opening distance exceeds the limit opening distance due to deformation of the hanging hook 10, even if the hanging hook 10 is tilted clockwise around the Y-axis direction, the shortest distance L between the outer edge surfaces 11b, 12b of the hanging hook 10 is longer than the shortest distance Lmax of the inner surface 92a of the groove of the inspection jig 90, so the hanging hook 10 cannot be inserted into the inspection jig 90 even if it is tilted to any angle around the Y-axis direction.

[0072] In this way, the hanging hook 10 can be inserted into the inspection jig 90 only when the outer edge surfaces 11b, 12b of the hanging hook 10 and the inner surface 92a of the pair of groove portions 92 of the inspection jig 90 are aligned in a straight line and parallel, and the shortest distance L between the linear outer edge surfaces 11b, 12b of the hanging hook 10 is less than the shortest distance Lmax between the inner surface 92a of the pair of groove portions 92 of the inspection jig 90.

[0073] In this state, the angle of the hanging hook 10 is such that the linearly extending outer edge surface 11b of the base end 11 and the linearly extending outer edge surface 12b of the tip end 12 both slide parallel to the inner surface 92a of the inspection jig 90.

[0074] The inner surface 93a of the internal plane 93 in the Y-axis direction of the inspection jig 90 and the two inner surfaces 93b and 93c facing each other across the space into which the hanging hook 10 is inserted are parallel to each other, and are formed so as to be approximately parallel to the flat surfaces (17a, 17b) of the thick portion 17 of the hanging hook 10.

[0075] The dimensions of the inspection jig 90 are set so that the shortest distance L2 between the inner surface 93a of the internal plane 93 of the inspection jig 90 and the opposing inner surfaces 93b and 93c in the Y-axis direction is the same as or approximately the same as the thickness of the thick portion 17 of the hanging hook 10.

[0076] Furthermore, an inner surface 94a of an inner flat surface 94 in the Y-axis direction of the inner surface 92a of the inspection jig 90 and a surface 94b facing the inner flat surface 94 across the space into which the hanging hook 10 is inserted are formed parallel to each other. The shortest distance L3 between them is set to be smaller than the shortest distance L2 between the inner flat surface 93 of the inspection jig 90, and the dimensions are set so as to be approximately the same as the thickness of the thin-walled portion 16 corresponding to the fin portion of the hanging hook 10.

[0077] As a result, when an undeformed hanging hook 10 is inserted into the inspection jig 90, the surface of the thick portion 17 of the hanging hook 10 is inserted so that it slides against either a pair of surfaces: the inner surface 93a of the internal plane 93 in the Y-axis direction of the inspection jig 90 and the opposing surfaces 93b and 93c, or the inner surface 94a of the groove portion 92 in the Y-axis direction and the opposing surface 94b.

[0078] On the other hand, if the tip 12 of the hanging hook 10 is deformed in the Y-axis direction, the inner surfaces 93a, 93b, and 93c of the internal plane 93 of the inspection jig 90 in the Y-axis direction will not be parallel to the surface of the thick portion 17 of the hanging hook 10, and the dimension of the hanging hook 10 in the Y-axis direction will be longer than the thickness of the thick portion 17, so it will be longer than the shortest distance L2 of the inner surface of the inspection jig 90 in the Y-axis direction, and the hanging hook 10 will not be able to be inserted into the inspection jig 90.

[0079] This prevents the hanging hook 10 from being mistakenly recognized as a non-defective product that can still be used even when the shortest distance L between the outer edge surfaces 11b, 12b of the hanging hook 10 has deformed so that it opens beyond the reference value, thereby reaching the limit of use of the hanging hook 10. Therefore, the opening can be inspected quickly and accurately with a simple operation.

[0080] Furthermore, even if the hanging hook 10 is deformed so as to be twisted in the Y-axis direction, it is possible to prevent the hook from being mistakenly recognized as a non-defective product that can still be used.

[0081] Next, a case where the hanging hook 80 is inserted into the inspection jig 100 in a comparative example will be described with reference to FIG.

[0082] In the comparative example, the inspection jig 100 has a structure similar to that of this embodiment. The difference is the shape of the groove 102, and even if the cross-sectional shapes of the base end 111 and the tip end 112 cut in the XY plane are significantly different, the dimensions are set with enough margin to allow the hanging hook 80 to be inserted. Therefore, as shown in the lower diagram of Figure 7A, rattles may occur depending on the cross-sectional shape of the hanging hook 80, which changes depending on the inclination of the hanging hook 80.

[0083] 7A indicates that the distance between the reference points 113 of the hanging hooks 80 is P, and B indicates that the distance between the reference points 113 of the hanging hooks 80 is P+α. In FIG. 7A, the upper diagram is a partial cross-sectional view of the lower diagram cut along line F-F and viewed from the direction of the arrows, and the lower diagram is a partial cross-sectional view of the upper diagram cut along line E-E and viewed from the direction of the arrows.

[0084] In the comparative example, reference marks 113 are embossed on the side surfaces of the base end 111 and the tip end 112 of the hanging hook 80. In such a hanging hook 80, if the measured distance between the reference marks 113 exceeds a predetermined range, it is determined that the opening is too open. The distance between the reference marks 113 is measured using a measuring tool such as a vernier caliper.

[0085] In the structure of the hanging hook 80 in the comparative example, as shown in A of Figure 7, when the distance P between the reference points 113 of the base end 111 and the tip end 112 is less than the standard dimension value, the hanging hook 80 can be inserted into the inspection jig 100.

[0086] On the other hand, when the distance P + α between the reference points 113 of the base end 111 and the tip end 112 is longer than the reference dimension value, the hanging hook 80 cannot be inserted into the inspection jig 100 when tilted as shown in A of Figure 7, but can be inserted into the inspection jig 100 if tilted counterclockwise around the Y axis as shown in B of Figure 7.

[0087] In this way, when inspecting the opening distance between the base end 111 and the tip end 112 of the hanging hook 80, depending on the tilt of the hanging hook 80 in a direction centered on the Y axis, it may be possible to determine that the product is good even if the distance P + α between the reference points 113 exceeds the standard dimension value.

[0088] In contrast to this, in this embodiment, the hanging hook 10 has parallel linear outer edge surfaces 11b, 12b, and the groove of the inspection jig 90 has parallel inner surfaces 92a, so if the opening distance between the base end 11 and the tip end 12 of the hanging hook 10 exceeds the limit opening distance even slightly, the hanging hook 10 cannot be inserted into the inspection jig 90. Therefore, the accuracy of non-defective product determination can be improved.

[0089] [Variations] In the first embodiment, the base end recess 14 and the tip end recess 15 are formed approximately parallel to each other on the linear outer edge surfaces 11b, 12b of the base end 11 and the tip end 12, respectively, but they do not necessarily have to be parallel as long as the opening distance of the hanging hook 10 can be measured by clamping it from the outside using a vernier caliper or the like.

[0090] Furthermore, the shapes of the base end recess 14 and the tip end recess 15 may be substantially U-shaped, triangular, or the like. Figure 4 is a diagram showing modified examples of the base end recess 14 and the tip end recess 15 in the hanging hook 10 according to the first embodiment. Figures 4A and 4B differ from the hanging hook 10 of this embodiment only in the shape of the recess, and are otherwise identical in shape. Figure 4C is an example of a shape in which recesses are provided in a hanging hook 60 that does not have linear portions in the outer shape of the base end and tip end.

[0091] In such hanging hooks 40, 50, 60, the base end recesses 44, 54, 64 may be arranged in a portion located above the base ends 41, 51, 61 on the X axis passing through approximately the center of the circle on the inner diameter side of the hanging hooks 40, 50, 60, and the tip end recesses 45, 55, 65 may be arranged near the tip ends 42, 52, 62 on the X axis.

[0092] In Fig. 4A, the base-end recesses 44, 54, 64 and the tip-end recesses 45, 55, 65 are cut out in a generally triangular shape when viewed in the direction shown. In Fig. 4B, the base-end recesses 54 and the tip-end recesses 55 are cut out in a generally U-shape with a curved bottom when viewed in the direction shown. In Fig. 4C, the base-end recesses 64 and the tip-end recesses 65 are cut out in a shape such that the radial depth of the hanging hook 60 becomes shallower toward the curved portion when viewed in the direction shown.

[0093] In the above embodiment, numbers are displayed as information about the hanging hook 10 on the thin portion 16 of the base end 11, but they may also be displayed on the thin portion 16 of the curved portion 13 or the tip end 12.

[0094] Furthermore, in the above embodiment, the hanging hook 10 for hanging a load has been described as an example, but the hanging hook 10 of this embodiment may also be used for the upper hook 3, a hook for a chain sling, etc.

[0095] [Supplementary Explanation of the Embodiments] The above-described embodiments each show a preferred specific example of the present invention. The numerical values, the arrangement positions of the components, the order of the connection forms, etc. shown in the above-described embodiments are merely examples and are not intended to limit the present invention. Furthermore, the drawings are not necessarily strict illustrations.

[0096] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

[0097] [Additional Notes] The contents of the above-described embodiments can be understood, for example, as follows.

[0098] (1) Parallel (no thinness restriction) A stator tube comprising: a base end 11 extending downward from a connecting portion 32 for hanging when suspended; a curved portion 13 extending from the lower end of the base end 11 and curved in an arc from the lower end to the other end; a tip end 12 connected to the other end of the curved portion 13 and extending upward; and an inner portion 30 surrounded by the base end 11, the curved portion 13, and the tip end 12; the base end 11, the curved portion 13, and the tip end 12 each having an inner edge surface 10a that contacts the inner portion 30 and an outer edge portion 10c opposite the inner edge surface 10a; the outer edge portion 10c of the base end 11 having an outer edge surface 11b that extends linearly in the extension direction and is located above the center of curvature of the curved portion 13 when suspended; The outer edge portion 10c of the tip portion 12 extends linearly in the extension direction and has an outer edge surface 12b that is positioned from below to above the center of curvature of the curved portion 13 when suspended, and the outer edge surface 11b and the outer edge surface 12b are positioned outward and parallel to each other.

[0099] This makes the linear outer edge surface 11b of the base end 11 and the linear outer edge surface 12b of the tip end 12 parallel, making it easier for the worker to grasp and hold the hanging hook 10, improving workability.

[0100] Furthermore, since the linear outer edge surface 11b of the base end 11 and the linear outer edge surface 12b of the tip end 12 are parallel, when an operator slides his / her finger while holding the hanging hook 10 in his / her hand, it is easy to detect that the hanging hook 10 has been deformed and its dimensions have changed.

[0101] Furthermore, in the unlikely event that the hanging hook 10 opens and the opening distance increases, the hooks are no longer parallel, making it easier to notice the change compared to when something that was originally not parallel changes. This makes it easier to visually detect abnormalities in the opening distance, improving the safety of the hanging hook 10.

[0102] (2) The hook for an inspection jig comprises: a base end 11 extending downward from a connecting portion 32 for hanging when the hook for an inspection jig is hung; a curved portion 13 extending from the lower end of the base end 11 and formed by curving in an arc from the lower end to the other end; a tip end 12 connected to the other end of the curved portion 13 and extending upward; and an inner portion 30 surrounded by the base end 11, the curved portion 13, and the tip end 12; the base end 11, the curved portion 13, and the tip end 12 have an inner edge surface 10a that contacts the inner portion 30 and an outer edge portion 10c opposite to the inner edge surface 10a; the outer edge portion 10c of the base end 11 and the outer edge portion 10c of the tip end 12 have outer edge surfaces 11b, 12b that extend linearly; the outer edge surface 11b that is the outer edge portion 10c of the base end 11 and the outer edge surface 12b that is the outer edge portion 10c of the tip end 12 are parallel to each other; The inspection jig 90 for inspecting the opening of the hanging hook 10 can insert the hanging hook 10 into the insertion portion 91f only when the opposing inner surfaces 92a of the insertion portion 91f inserted from the curved portion 13 side are parallel, and the opening angle of the hanging hook 10 is such that the linearly extending outer edge surface 11b of the base end portion 11 and the linearly extending outer edge surface 12b of the tip end portion 12 both slide parallel to the inner surface 92a.

[0103] This allows the opening of the hanging hook 10, which has linear outer edge surfaces 11b, 12b that are parallel to each other at the base end 11 and the tip end 12, to be inspected using the inspection jig 90 whose inner surface 92a is parallel, so that the hanging hook 10 is inserted into the insertion portion 91f only when the linear outer edge surface 11b of the base end 11 and the linear outer edge surface 12b of the tip end 12 are both at an angle where they slide parallel to the inner surface 92a.

[0104] Therefore, when the opening distance of the hanging hook 10 exceeds the limit opening distance, it is possible to prevent the hanging hook 10 from being inserted into the inspection jig 90 at an angle other than the appropriate angle for the hanging hook 10, and determining that the hanging hook 10 is usable even though it has reached its usability limit. Therefore, it is possible to simply yet accurately determine whether the opening of the hanging hook 10 is abnormal.

[0105] Furthermore, it is possible to determine whether the opening distance of the hanging hook 10 exceeds the limit opening distance without using a measuring tool such as a caliper. Furthermore, it is possible to check whether the opening distance is equal to or less than the limit opening distance without knowing the specific opening distance of the hanging hook 10, thereby simplifying the work of the worker.

[0106] (3) Recesses The proximal recess 14 may be formed on the outer peripheral surface 11b, and the distal recess 15 may be formed on the outer peripheral surface 12b.

[0107] This allows the measurement to be made by clamping the suspension hook 10 from the outside when measuring the distance between the base end recess 14 and the tip end recess 15 using a vernier caliper, so that the vernier caliper does not shift and the opening distance of the suspension hook 10 can be measured stably and accurately in a simple manner.

[0108] Furthermore, since the base end recess 14 and the tip end recess 15 are formed on the outside of the hanging hook 10, the measurement point can be confirmed at a glance, thereby shortening the time required for the measurement work.

[0109] Furthermore, by forming the base end recess 14 and the tip end recess 15 on the outside of the hanging hook 10, they blend seamlessly into the design compared to when they are formed on the surface between the outside and inside, thereby improving the design.

[0110] Furthermore, since the base-end recess 14 and the tip-end recess 15 are both formed on straight outer edge surfaces 11b, 12b, it is easier to set the caliper in the base-end recess 14 and the tip-end recess 15 than when they are formed on curved outer edge surfaces, and even if the caliper floats out of the base-end recess 14 and the tip-end recess 15, it will not slide away and can be quickly returned to the inside of the base-end recess 14 and the tip-end recess 15.

[0111] (4) Bending Force The base end recess 14 can be formed closer to the connecting portion 32 than the position 19 where the bending force acting on the hanging hook 10 is at its maximum.

[0112] As a result, the base end recess 14 is positioned at a position that is relatively unlikely to deform due to bending forces, so that the opening distance of the hanging hook 10 can be measured between the base end recess 14 and the tip end recess 15, which is relatively likely to deform due to bending forces, and the opening distance of the hanging hook 10 can be measured more accurately.

[0113] (5) Numbers on the thin portion. The hook 10 has a thick portion 17 formed on the inner edge surface 10a and a thin portion 16 formed on the outer edge surface 10c that is thinner than the thick portion 17. The base end recess 14 and the tip end recess 15 are formed in the thin portion 16, and information about the hanging hook 10 can be written on the thin portion 16.

[0114] As a result, the area of ​​the thin portion 16 of the base end portion 11 is maximized, so that information relating to the hanging hook 10 can be displayed larger, improving visibility.

[0115] Furthermore, since information can be written near the base-end recess 14, if the written information relates to the opening distance of the hanging hook 10, when measuring the opening distance of the hanging hook 10 with a vernier caliper, the reference value will be displayed near the base-end recess 14, thereby improving workability.

[0116] Furthermore, since the base end recess 14, the tip end recess 15, and the thin portion 16 are formed, it is possible to reduce the dimensions of the base end recess 14 and the tip end recess 15 in the thickness direction of the hanging hook 10. This makes it easy to align the calipers with the bottom surfaces of the base end recess 14 and the tip end recess 15 in parallel, thereby simplifying the measurement work using the calipers.

[0117] (6) Deformation Detection 1, 2 The hook 10 has a thick portion 17 formed on the inner edge surface 10a, and a thin portion 16 formed on the outer edge surface 10c that is thinner than the thick portion 17. The hook 10 also has a linear boundary portion 18c that is a part of the boundary portion 18 between the thick portion 17 and the thin portion 16 and is provided at the base end 11 and the tip end 12, respectively. The outer edge surface 11b and the outer edge surface 12b are first deformation detection portions that detect deformation of the hanging hook 10, and the linear boundary portion 18c can be a second deformation detection portion that visually detects deformation of the hanging hook 10.

[0118] As a result, the boundary straight line portion 18c, which is easy to see, is set as the second deformation detection portion, making it easier to visually notice deformation of the hanging hook 10. Therefore, if deformation of the hanging hook 10 is suspected when visually checking the second deformation detection portion, damage to the hanging hook 10 can be further prevented by performing measurement at the first deformation detection portion, thereby improving safety.

[0119] Furthermore, the inspection jig 90 has a groove 92 that prevents the hanging hook 10 from moving in any direction other than the insertion direction, and the thick-walled portion 17 is shaped so that it cannot enter the groove 92. Therefore, if the opening distance of the hanging hook 10 exceeds the limit opening distance, when the hanging hook 10 is inserted into the inspection jig 90, the boundary straight portion 18c on the base end side of the thick-walled portion 17 and the thin-walled portion 16 of the hanging hook 10 gets caught on the groove 92 (the boundary between the internal flat surface 93 and the internal flat surface 94) of the inspection jig 90, and the hanging hook 10 cannot be inserted. Therefore, the boundary straight portion 18c functions as a second deformation detection portion even when the inspection jig 90 is used for inspection, and the accuracy of the inspection can be improved, thereby increasing safety.

[0120] (7) Boundary Linear Portion 1 The boundary line portions 18c can be parallel to each other.

[0121] As a result, when the hanging hook 10 opens and the opening distance increases, the boundary straight line portions 18c are no longer parallel, making it easier to notice the change compared to when something that was originally not parallel changes. Therefore, it becomes easier to visually detect abnormalities in the opening distance, and the safety of the hanging hook 10 can be improved.

[0122] (8) Boundary Linear Portion 2 The boundary linear portions 18c are formed at an incline so that they approach each other as they move away from the curved portion 13, and can approach each other in parallel when the hanging hook 10 is deformed.

[0123] As a result, when the hanging hook 10 opens and the opening distance becomes large, the boundary straight line part 18c becomes a parallel shape that can be easily confirmed visually, so that deformation of the hanging hook 10 can be found earlier.

[0124] (9) Deformation Detection 3 In addition, a hook latch 21 is provided at the base end 11 and rotates to abut against the tip end 12, and the portion of the tip end 12 where the hook latch 21 abuts can function as a third deformation detection unit that visually detects deformation of the hanging hook 10.

[0125] As a result, the portion of the tip 12 that the hook latch 21 abuts against can develop scratches or paint peeling due to the repeated abutment and separation of the hook latch 21, and when the hanging hook 10 opens and the opening distance increases, the position of the scratches, etc. changes. Therefore, deformation of the hanging hook 10 can be confirmed simply by visually checking the position of the scratches, etc., so deformation of the hanging hook 10 can be discovered at an earlier stage.

[0126] (10) Flat portion: The flat portion also has a thick portion 17 formed on the inner edge surface 10a and a thin portion 16 formed on the outer edge surface 11b that is thinner than the thick portion 17. The thin portion 16 extends upward from the outer edge surface 11b in a flat plate shape that is wider than the other portions, and information about the hanging hook 10 can be written three-dimensionally on the thin portion 16 in a convex or concave shape from the surrounding area.

[0127] As a result, the thin portion 16 extending upward from the linear outer edge surface 11b of the base end 11 of the hanging hook 10 is wider and flatter than the other portions, allowing an operator to easily grasp the hanging hook 10 by, for example, pinching it with their thumb and index finger. Furthermore, since information about the hanging hook 10 is written in convex or concave shapes on the thin portion 16, when an operator grasps the thin portion 16, the convex or concave shape acts as an anti-slip catch for the operator's fingers, preventing the hanging hook 10 from slipping. This improves the ease of work performed when grasping the hanging hook 10.

[0128] (11) Angle θb In addition, the angle θb formed between the horizontal plane and the outer edge surface 11b in the suspended state can be set to 75°±5°.

[0129] This allows the opening dimensions of the hanging hook 10 to be set to an appropriate value. In other words, if the angle is reduced, the opening dimensions will be larger, but the hooking depth of the sling will be shallower, making it easier for a wire rope or other object hooked on the sling to come loose. Furthermore, if the angle of the outer edge surface 12b of the tip portion 12 is reduced while the angle of the opening with respect to the X-X axis is fixed at the angle of this embodiment, the dimension between the inner edge surface 10a and the outer edge surface 12b of the tip portion 12 will be larger, resulting in a thicker portion than necessary to ensure the required strength, resulting in increased weight and increased costs. On the other hand, if the angle is increased, the tip portion 12 will be more upright, thereby reducing the opening dimensions. However, to ensure the appropriate opening dimensions, the overall vertical length of the hanging hook 10 must be increased, which increases the weight and cost of the hanging hook 10.

[0130] Therefore, the angle formed between the horizontal plane and the outer edge surface 11b is set to 75°±5°, and preferably in the range of 72° to 78°.

[0131] This prevents the wire rope or the like hooked on the hanging hook 10 from coming off, while suppressing the vertical dimension of the hanging hook 10, thereby avoiding increases in weight and costs.

[0132] (12) Recess Position: The base end 11 is provided with a support shaft 22 as a pivot axis, and a hook latch 21 that pivots to abut against the tip end 12. When the hook latch 21 abuts against the narrow portion 24 of the tip end 12, the base end recess 14 and the tip end recess 15 can be positioned so that the straight line connecting the base end recess 14 and the tip end recess 15 does not interfere with the hook latch 21.

[0133] This makes it easier to measure the dimension between the base end recess 14 and the tip end recess 15 using a caliper or ruler, as the hook latch does not interfere.

[0134] (13) A hanging hook 10 having a thick portion 17 extending toward the inner diameter side of the hook having a recess, and a thin portion 16 extending from the thick portion 17 toward the outer diameter side and thinner than the thick portion 17, comprising: a base end 11 extending downward from a hanging connecting portion 32 and having a base end recess 14 on an outer edge surface 11b; and a tip end 12 facing the base end 11 and having a tip end recess 15 on an outer edge surface 12b.

[0135] This allows the measurement to be made by clamping the suspension hook 10 from the outside when measuring the distance between the base end recess 14 and the tip end recess 15 using a vernier caliper, so that the vernier caliper does not shift and the opening distance of the suspension hook 10 can be measured stably and accurately in a simple manner.

[0136] Furthermore, since the base end recess 14 and the tip end recess 15 are formed on the outside of the hanging hook 10, the measurement point can be confirmed at a glance, thereby shortening the time required for the measurement work.

[0137] Furthermore, by forming the base end recess 14 and the tip end recess 15 on the outside of the hanging hook 10, they blend seamlessly into the design compared to when they are formed on the surface between the outside and inside, thereby improving the design.

[0138] (14) An inspection jig 90 for inspecting the opening of a hanging hook 10, comprising: a main body 91 having a storage section 91b into which the hanging hook 10 is inserted and stored; and grooves 92 provided on both widthwise ends of the storage section 91b, formed inside the main body 91, extending linearly in the insertion direction and preventing the hanging hook 10 from moving in any direction other than the insertion direction, wherein when the hanging hook 10 is stored in the storage section 91b, inner surfaces 92a of a pair of grooves 92 facing each other in the radial direction of the hanging hook 10 are parallel to each other, and the distance between the inner surfaces 92a is set so that the hanging hook 10 can slide.

[0139] As a result, the hanging hook 10, which has parallel surfaces facing each other at both radial ends of the outer edge surfaces 11b, 12b, is inserted into the groove portion 92, and the outer edge surfaces 11b, 12b of the hanging hook 10 slide against the inner surface 92a of the groove portion 92. Therefore, by setting the dimension between the inner surfaces 92a in advance to the limit opening distance of the opening distance of the hanging hook 10, the hanging hook 10 cannot be inserted into the groove portion 92 if the opening distance exceeds the limit opening distance, and therefore the opening of the hanging hook 10 can be easily and accurately discriminated.

[0140] Furthermore, because the inner surfaces 92a of the grooves 92 are parallel to each other, the hanging hook 10 cannot be inserted into the inspection jig 90 unless the parallel outer edge surfaces 11b, 12b at both radial ends of the hanging hook 10 are parallel to the inner surfaces 92a of the grooves 92 at a specific inclination. Therefore, even if the opening distance becomes slightly longer, the hanging hook 10 cannot be inserted into the inspection jig 90 unless the inclination is specific, so it is possible to accurately determine whether the distance L between the parallel outer edge surfaces 11b, 12b at both radial ends of the hanging hook 10, which changes in synchronization with the opening distance, is longer than the reference value Lmax.

[0141] DESCRIPTION OF SYMBOLS 10 Hanging hook 10a Inner edge surface (inner peripheral portion) 10c Outer edge portion (outer peripheral portion) 11 Base end portion 11b Outer edge surface (first outer peripheral surface) 12 Tip portion 12b Outer edge surface (second outer peripheral surface) 13 Curved portion 14 Base end recess 15 Tip end recess 16 Thin portion 17 Thick portion 18c Boundary straight line portion 19 Position where bending force is maximum 21 Hook latch 22 Support axis (rotating axis) 30 Inside portion 32 Connecting portion 90 Inspection jig 91 Main body portion 91b Storage portion 91f Insertion portion 92 Groove portion 92a Inner surface

Claims

a base end portion that extends downward from the connecting portion for hanging in a hanging state; a curved portion extending from a lower end of the base end portion and curved in an arc shape from the lower end toward the other end; a tip portion connected to the other end of the curved portion and extending upward; an inner portion surrounded by the base end portion, the curved portion, and the tip end portion; Equipped with the base end portion, the curved portion, and the tip portion each have an inner circumferential portion in contact with the inner portion, and an outer circumferential portion opposite the inner circumferential portion, The outer circumferential portion of the base end portion has a first outer circumferential surface that extends linearly in the extension direction and is located above the bending center of the bending portion in a suspended state, The outer circumferential portion of the tip portion has a second outer circumferential surface that extends linearly in the extension direction and is positioned from below to above the bending center of the bending portion in a suspended state, The first outer peripheral surface and the second outer peripheral surface are in a positional relationship in which they face outward and are parallel to each other. A hanging hook characterized by: 　 a base end portion that extends downward from the connecting portion for hanging in a hanging state; a curved portion extending from a lower end of the base end portion and curved in an arc shape from the lower end toward the other end; a tip portion connected to the other end of the curved portion and extending upward; an inner portion surrounded by the base end portion, the curved portion, and the tip end portion; Equipped with the base end portion, the curved portion, and the tip portion each have an inner circumferential portion in contact with the inner portion, and an outer circumferential portion opposite the inner circumferential portion, The outer periphery of the base end portion and the outer periphery of the tip end portion have outer periphery surfaces that extend linearly, a first outer circumferential surface that is the outer circumferential surface of the base end portion and a second outer circumferential surface that is the outer circumferential surface of the tip end portion are parallel to each other, The inspection jig for inspecting the opening of the hanging hook has an insertion part that is inserted from the curved part side, and the opposing inner surfaces of the insertion part are parallel to each other, The hanging hook can be inserted into the insertion portion only when the opening angle of the hanging hook is an angle at which the linearly extending outer peripheral surface of the base end portion and the linearly extending outer peripheral surface of the tip end portion both slide in parallel with the inner surface. A hanging hook characterized by: 　 The hanging hook according to claim 1 or 2, a base end recess formed on the first outer circumferential surface; a tip-side recess formed on the second outer peripheral surface; A hanging hook comprising: 　 The hanging hook according to claim 3, The base-end recess is formed on the connecting portion side from a position where a bending force acting on the hanging hook is maximum. A hanging hook characterized by: 　 The hanging hook according to claim 3, a thick portion formed on the inner peripheral portion and a thin portion formed on the outer peripheral portion that is thinner than the thick portion, the base-end recess and the tip-end recess are formed in the thin-walled portion, The thin portion has information about the hanging hook written on it. A hanging hook characterized by: 　 The hanging hook according to claim 1 or 2, a thick portion formed on the inner peripheral portion and a thin portion formed on the outer peripheral portion that is thinner than the thick portion, and a linear boundary portion that is a part of a boundary between the thick portion and the thin portion and is provided at each of the base end and the tip end, the first outer peripheral surface and the second outer peripheral surface are a first deformation detection unit that detects deformation of the hanging hook, The boundary straight line portion is a second deformation detection portion that visually detects deformation of the hanging hook. A hanging hook characterized by: The hanging hook according to claim 6, The boundary straight lines become parallel to each other, indicating that an overload has been applied. A hanging hook characterized by: 　 The hanging hook according to claim 6, The boundary straight line portions are formed to be inclined so as to approach each other as they move away from the curved portion, and approach each other in parallel when the hanging hook is deformed. A hanging hook characterized by: 　 The hanging hook according to claim 1 or 2, A hook latch is provided at the base end portion and rotates to contact the tip end portion, The portion of the tip end with which the hook latch abuts functions as a third deformation detection portion that visually detects deformation of the hanging hook. A hanging hook characterized by: 　 The hanging hook according to claim 1 or 2, a thick portion formed on the inner peripheral portion and a thin portion formed on the outer peripheral portion that is thinner than the thick portion, The thin portion extends upward from the first outer peripheral surface in a flat plate shape that is wider than other portions, The thin portion has information about the hanging hook three-dimensionally written in a convex or concave shape from the surrounding area. A hanging hook characterized by: 　 The hanging hook according to claim 1 or 2, In a suspended state, the angle between the horizontal plane and the first outer peripheral surface is set to 75°±5°. A hanging hook characterized by: 　 The hanging hook according to claim 3, A hook latch is provided at the base end portion and rotates to contact the tip end portion, When the hook latch is in contact with the distal end portion, the base end recess and the distal end recess are provided at positions such that a straight line connecting the base end recess and the distal end recess does not interfere with the hook latch. A hanging hook characterized by: 　 A hanging hook having a thick portion extending toward an inner diameter side and a thin portion extending toward an outer diameter side from the thick portion and thinner than the thick portion, a base end portion extending downward from the connecting portion for hanging and having a base end recess on an outer circumferential surface; a tip end portion facing the base end portion and having a tip end recess on an outer circumferential surface; A hanging hook comprising: 　 An inspection jig for inspecting the opening of a hanging hook, a main body portion having a storage portion into which the hanging hook is inserted and stored; a groove formed inside the main body, the groove being provided on both ends of the accommodation portion in the width direction, and extending linearly in the insertion direction to prevent the hanging hook from moving in any direction other than the insertion direction; Equipped with When the hanging hook is accommodated in the accommodation portion, inner surfaces of the pair of groove portions facing each other in the radial direction of the hanging hook are parallel to each other, and the distance between the inner surfaces is set so that the hanging hook slides against the inner surfaces. An inspection jig characterized by:

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